Technical data
Heating system types
14
Heating system types for condensing boilers (continued)
System type 4 - Single-boiler system with Vitocrossal 300 with several heating circuits and one modulating supply
temperature heating circuit
A Boiler with Vitotronic 300
B Domestic hot water tank
C Heating circuit with mixing valve
D Modulating supply temperature
heating circuit
or
E Underfloor heating circuit
F High limit thermostat (max. limit)
G Neutralizing unit
plugs
! Outdoor temperature sensor
? M2 Supply temperature sensor,
mixing valve circuit 2
? M3 Supply temperature sensor,
mixing valve circuit 3
§ Boiler temperature sensor
% DHW tank temperature sensor
sÖ A1 Heating circuit without mixing
valve (if installed)
sÖ M2 Heating circuit pump, mixing
valve circuit 2
sÖ M3 Heating circuit pump, mixing
valve circuit 3
sA Circulation pump for heating
the DHW tank
sK DHW re-circulation pump
fÖ Power supply connection
120 VAC
fA Burner (1st stage)
gS M2 Mixing valve motor, mixing
valve circuit 2
gS M3 Mixing valve motor, mixing
valve circuit 3
lÖ Burner (2nd stage/modulating)
aVD Connection of external
equipment (see page 38)
aVH Connection of external
equipment (see page 39)
5285 941 v.1.5
20
2
20
52
2
20
52
A1 M2 M3
3
5
21
28
1
B
C D
2
20
52
M3
A
90
41
40
146
143
G
or
E
2
M3
20
52
2
20
52
M2
F